Abacus
Before calculators were invented, a lot of Asian countries use abacus to calculate. Abacus is an ancient calculating device. It can be used for solving addition, subtraction, division and multiplication problems. It was developed by Chinese, Japanese, and Egyptians in about 500 B.C. Abacus is traced by tray, rod , and beads.
Handheld Calculator
In 1967, the first hand-held pocket calculator was invented by Jerry D. Merryman, James H. Van Tassel and Jack St. Clair Kilby at Texas Instruments, Incorporated (TI). And in1974 a basic patent for miniature electronic calculators has been issued to Texas Instruments Incorporated. Unlike other old calculater devices. This calculator is really small, easy to carry, and very easy to calculate to solve math problems.This calculator also leads to the new calculators that we are using now.
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